﻿using System;
using System.Text.RegularExpressions;
using Microsoft.AspNetCore.Http;

namespace Girvs.Extensions
{
    public static class RequestExtensions
    {
        //regex from http://detectmobilebrowsers.com/
        private static readonly Regex b = new Regex(
            @"(android|bb\d+|meego).+mobile|avantgo|bada\/|blackberry|blazer|compal|elaine|fennec|hiptop|iemobile|ip(hone|od)|iris|kindle|lge |maemo|midp|mmp|mobile.+firefox|netfront|opera m(ob|in)i|palm( os)?|phone|p(ixi|re)\/|plucker|pocket|psp|series(4|6)0|symbian|treo|up\.(browser|link)|vodafone|wap|windows ce|xda|xiino",
            RegexOptions.IgnoreCase | RegexOptions.Multiline);

        private static readonly Regex v = new Regex(
            @"1207|6310|6590|3gso|4thp|50[1-6]i|770s|802s|a wa|abac|ac(er|oo|s\-)|ai(ko|rn)|al(av|ca|co)|amoi|an(ex|ny|yw)|aptu|ar(ch|go)|as(te|us)|attw|au(di|\-m|r |s )|avan|be(ck|ll|nq)|bi(lb|rd)|bl(ac|az)|br(e|v)w|bumb|bw\-(n|u)|c55\/|capi|ccwa|cdm\-|cell|chtm|cldc|cmd\-|co(mp|nd)|craw|da(it|ll|ng)|dbte|dc\-s|devi|dica|dmob|do(c|p)o|ds(12|\-d)|el(49|ai)|em(l2|ul)|er(ic|k0)|esl8|ez([4-7]0|os|wa|ze)|fetc|fly(\-|_)|g1 u|g560|gene|gf\-5|g\-mo|go(\.w|od)|gr(ad|un)|haie|hcit|hd\-(m|p|t)|hei\-|hi(pt|ta)|hp( i|ip)|hs\-c|ht(c(\-| |_|a|g|p|s|t)|tp)|hu(aw|tc)|i\-(20|go|ma)|i230|iac( |\-|\/)|ibro|idea|ig01|ikom|im1k|inno|ipaq|iris|ja(t|v)a|jbro|jemu|jigs|kddi|keji|kgt( |\/)|klon|kpt |kwc\-|kyo(c|k)|le(no|xi)|lg( g|\/(k|l|u)|50|54|\-[a-w])|libw|lynx|m1\-w|m3ga|m50\/|ma(te|ui|xo)|mc(01|21|ca)|m\-cr|me(rc|ri)|mi(o8|oa|ts)|mmef|mo(01|02|bi|de|do|t(\-| |o|v)|zz)|mt(50|p1|v )|mwbp|mywa|n10[0-2]|n20[2-3]|n30(0|2)|n50(0|2|5)|n7(0(0|1)|10)|ne((c|m)\-|on|tf|wf|wg|wt)|nok(6|i)|nzph|o2im|op(ti|wv)|oran|owg1|p800|pan(a|d|t)|pdxg|pg(13|\-([1-8]|c))|phil|pire|pl(ay|uc)|pn\-2|po(ck|rt|se)|prox|psio|pt\-g|qa\-a|qc(07|12|21|32|60|\-[2-7]|i\-)|qtek|r380|r600|raks|rim9|ro(ve|zo)|s55\/|sa(ge|ma|mm|ms|ny|va)|sc(01|h\-|oo|p\-)|sdk\/|se(c(\-|0|1)|47|mc|nd|ri)|sgh\-|shar|sie(\-|m)|sk\-0|sl(45|id)|sm(al|ar|b3|it|t5)|so(ft|ny)|sp(01|h\-|v\-|v )|sy(01|mb)|t2(18|50)|t6(00|10|18)|ta(gt|lk)|tcl\-|tdg\-|tel(i|m)|tim\-|t\-mo|to(pl|sh)|ts(70|m\-|m3|m5)|tx\-9|up(\.b|g1|si)|utst|v400|v750|veri|vi(rg|te)|vk(40|5[0-3]|\-v)|vm40|voda|vulc|vx(52|53|60|61|70|80|81|83|85|98)|w3c(\-| )|webc|whit|wi(g |nc|nw)|wmlb|wonu|x700|yas\-|your|zeto|zte\-",
            RegexOptions.IgnoreCase | RegexOptions.Multiline);

        public static bool IsMobileBrowser(this HttpRequest request)
        {
            if (request == null) throw new ArgumentNullException(nameof(request));
            var userAgent = request.UserAgent();
            if ((b.IsMatch(userAgent) || v.IsMatch(userAgent.Substring(0, 4))))
            {
                return true;
            }

            return false;
        }

        public static string UserAgent(this HttpRequest request)
        {
            if (request == null) throw new ArgumentNullException(nameof(request));
            return request.Headers["User-Agent"];
        }

        public static string GetUserRemoteIpAddress(this HttpRequest request)
        {
            if (request == null) throw new ArgumentNullException(nameof(request));
            return request.HttpContext.Connection.RemoteIpAddress.ToString();
        }

        public static string GetRequestClientAddress(this HttpRequest request)
        {
            var clientAddress = request.Headers["ClientAddress"];
            if (string.IsNullOrEmpty(clientAddress))
            {
                return request.HttpContext.Connection.RemoteIpAddress.ToString();
            }

            return clientAddress.ToString();
        }

        public static string GetApiGateWayRemoteIpAddress(this HttpRequest request)
        {
            const string ClientIP = "ClientIP";
            if (request.Headers.ContainsKey(ClientIP))
            {
                return request.Headers[ClientIP];
            }

            return GetUserRemoteIpAddress(request);
        }

        public static string GetUserIpAddress(this HttpRequest request)
        {
            var result = string.Empty;
            result = request.HttpContext.GetServerVariable("HTTP_X_FORWARDED_FOR");
            if (!string.IsNullOrEmpty(result))
            {
                //可能有代理
                if (result.IndexOf(".") == -1) //没有“.”肯定是非IPv4格式
                    result = null;
                else
                {
                    if (result.IndexOf(",") != -1)
                    {
                        //有“,”，估计多个代理。取第一个不是内网的IP。
                        result = result.Replace(" ", "").Replace("'", "");
                        var temparyip = result.Split(",;".ToCharArray());
                        foreach (var t in temparyip)
                        {
                            if (CommonHelper.IsValidIpAddress(t)
                                && t.Substring(0, 3) != "10."
                                && t.Substring(0, 7) != "192.168"
                                && t.Substring(0, 7) != "172.16.")
                            {
                                return t; //找到不是内网的地址
                            }
                        }
                    }
                    else if (CommonHelper.IsValidIpAddress(result)) //代理即是IP格式 ,IsIPAddress判断是否是IP的方法,
                        return result;
                    else
                        result = null; //代理中的内容 非IP，取IP
                }
            }

            string IpAddress =
                (request.HttpContext.GetServerVariable("HTTP_X_FORWARDED_FOR") != null &&
                 request.HttpContext.GetServerVariable("HTTP_X_FORWARDED_FOR") != String.Empty)
                    ? request.HttpContext.GetServerVariable("HTTP_X_FORWARDED_FOR")
                    : request.HttpContext.GetServerVariable("REMOTE_ADDR");

            if (null == result || result == String.Empty)
                result = request.HttpContext.GetServerVariable("REMOTE_ADDR");

            if (result == null || result == String.Empty)
                result = request.GetUserRemoteIpAddress();

            return result;
        }
    }
}